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x86, memblock: Use memblock_memory_size()/memblock_free_memory_size() to get correct dma_reserve

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memblock_memory_size() will return memory size in memblock.memory.region.
memblock_free_memory_size() will return free memory size in memblock.memory.region.

So We can get exact reseved size in specified range.

Set the size right after initmem_init(), because later bootmem API will
get area above 16M. (except some fallback).

Later after we remove the bootmem, We could call that just before paging_init().

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Yinghai Lu 2010-08-25 13:39:18 -07:00 committed by H. Peter Anvin
parent a587d2daeb
commit 6f2a75369e
4 changed files with 19 additions and 7 deletions
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2
arch/x86/include/asm/e820.h
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@ -117,6 +117,8 @@ extern unsigned long e820_end_of_low_ram_pfn(void);
extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
void memblock_x86_fill(void);
void memblock_find_dma_reserve(void);
extern void finish_e820_parsing(void);
extern void e820_reserve_resources(void);
extern void e820_reserve_resources_late(void);

16
arch/x86/kernel/e820.c
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@ -1105,3 +1105,19 @@ void __init memblock_x86_fill(void)
memblock_analyze();
memblock_dump_all();
}
void __init memblock_find_dma_reserve(void)
{
#ifdef CONFIG_X86_64
u64 free_size_pfn;
u64 mem_size_pfn;
/*
* need to find out used area below MAX_DMA_PFN
* need to use memblock to get free size in [0, MAX_DMA_PFN]
* at first, and assume boot_mem will not take below MAX_DMA_PFN
*/
mem_size_pfn = memblock_x86_memory_in_range(0, MAX_DMA_PFN << PAGE_SHIFT) >> PAGE_SHIFT;
free_size_pfn = memblock_x86_free_memory_in_range(0, MAX_DMA_PFN << PAGE_SHIFT) >> PAGE_SHIFT;
set_dma_reserve(mem_size_pfn - free_size_pfn);
#endif
}

1
arch/x86/kernel/setup.c
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@ -1013,6 +1013,7 @@ void __init setup_arch(char **cmdline_p)
#endif
initmem_init(0, max_pfn, acpi, k8);
memblock_find_dma_reserve();
#ifndef CONFIG_NO_BOOTMEM
memblock_x86_to_bootmem(0, max_low_pfn<<PAGE_SHIFT);
#endif

7
arch/x86/mm/init_64.c
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@ -53,8 +53,6 @@
#include <asm/init.h>
#include <linux/bootmem.h>
static unsigned long dma_reserve __initdata;
static int __init parse_direct_gbpages_off(char *arg)
{
direct_gbpages = 0;
@ -821,11 +819,6 @@ int __init reserve_bootmem_generic(unsigned long phys, unsigned long len,
reserve_bootmem(phys, len, flags);
if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) {
dma_reserve += len / PAGE_SIZE;
set_dma_reserve(dma_reserve);
}
return 0;
}
#endif